PSP firmware 2.0 to 1.5 downgrader

Aight, those of you PSP owners who
fell for went for the 2.0 firmware update and soon thereafter mourned the loss of homebrew goodness —
there's apparently now a working downgrader that'll take you back to the glory days of firmware 1.5. Of course, it goes
without saying that you attempt this at your own risk as it could damage your pacemaker, adjust your refrigerator's
coolness settings or otherwise reach out to sully those things we hold most dear — so caveat hacker, mmmkay?